import java.util.*;

public class Circle2 {
    double radius;
    
    static int numberOfObjects = 0;
    
    Circle2() {
        radius = 1.0;
        numberOfObjects++;
    }
    
    Circle2(double newRadius) {
        radius = newRadius;
        numberOfObjects++;
    }
    
    static int getNumberOfObjects() {
        return numberOfObjects;
    }
    
    double getArea() {
        return radius * radius * Math.PI;
    }
}